It can be fought with the Ditto trick with a Special stat of 252 (hex:FC).

Trainer AI

As documented by TheZZAZZGlitch, this Trainer's secondary AI pointer is at $D040, and uses a 'move modification' routine that points to $FA58 in the Echo RAM region, which is part of the Day Care Pokémon data. If this data is harmless, it can fall through to $FA80; a copy of the data for the stored Pokémon in the PC, in which a bootstrap Pokémon setup can be prepared to abuse arbitrary code execution. The code at region $D040 may need to be adjusted to not freeze the game as well.

Roster data

As documented by TheZZAZZGlitch, roster 1 of this glitch Trainer is sourced from $A5A5 in SRAM, which can be modified by the user with relevant corruptions (such as corruptions from a glitch Pokémon sprite). The SRAM can be unlocked by viewing the status of any valid Pokémon.